The application for fertilizer yield relationships of the ET yield response factor equation

Abstract

Many attempts have been made to understand the plant response to water using plant growth models. Te efects of fertilizeron crop yield are greater than those of water. Terefore, some models that have been developed for the evaluation of water yieldrelationships can also be used for fertilizer yield relationships. Te purpose of this study was to develop an equation to use in fertilizerapplications similar to one used to evaluate crop production under adequate and defcit water supply regimes. Te equation can berewritten for the fertilizer consumed by plants instead of the evapotranspiration (ET). Sample applications showed that the resultingET yield response factor equation can be used successfully in the evaluation of fertilizer yield relationships. Tus, the yield loss per unitof fertilizer defciency can be determined more precisely by the equation.